You might struggle to take back bedding that has been opened, and put on the bed. It couldn't be resold for hygiene reasons.

Regardless, he bought bedding that he thought you'd like, and put in on the bed. It'd be a proper kick in the face to take it back. Leave it, and swap it for yours when it arrives. Eventually it'll just remind you of him being sweet.

I left my our bed in arty swishy go with anything colours, returned to find new BROWN bedding. DH will not learn. It's already gone.

When I met him he had a penchant for buying covers that looked like the Serengeti on acid or a carefully dissected Zebra, that has yellowed slightly in the sun... which is okay, but not really in keeping with his Welsh roots. (Though a dragon would have been equally unacceptable).

I'm not precious (honest) but I don't like tones of yellow/dead zebra.

It was his choice and he likes it, its not all about what you want. He sounds very thoughtful. No wonder he had the hump he is probably disappointed. I have things in the house I wouldn't have chosen but they have been chosen by someone I love so it makes it ok.

When my brother left his wife, he bought chartreuse sheets and duvet cover. For Christmas, I made him a navy, red, and white quilt. My sister bought him white sheets piped in red. My DH had a purple and olive duvet before he met me. I made a cover for it after we had dated a few months. Most straight men should not be trusted in the soft furnishings or bed/bath departments...

You could use it as the spare set for when the cat sicks up a hair ball, the tea gets spilt or the LO's have an accident on your bed. But you should still use it as he did try to help and its his home too.